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Prefix used in SI units of measurement, equivalent to a one-billionth part (10^-9). For example, a nanosecond is one-billionth of a second.

Initially the sun and moon had human faces, but they were removed when the flag was updated in 1962. The flag is said to express the hope that Nepal will endure as long as the sun and the moon. The blue border symbolizes peace. Effective date: 16 December 1962. >>